\ifcmh
	body of the environment body of the environment body of the environment
\fi
some more text

\ifcmh
	#1<2 body of the environment body of the environment body of the environment
\fi
% comment!

\ifodd
	\mynumber body of the environment body of the environment body of the environment
\fi
% comment!

here is some text%
\if
	x^2
\fi
text

\if
	body %comment
\fi

\if
	% here's a comment
	body
\else
	else body
\fi
